Martin Gregorie wrote:

I'd agree that its probably too hard to spin for spin training.

And that is exactly what this thread has been all about:

We are planning a Glider Aerobatics Workshop at Williams Gliderport!
....
This is for a basic introduction to aerobatics.

BTW, I did my primary aerobatics training in an ASK21 with tail ballast.
It spins wonderfully, and it was a very good exercise to calculate the
tail ballast, mount it and then having to believe my own calculation.